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Tomatoes

This juicy fruit is the best dietary source of lycopene, a carotenoid that gives tomatoes their red hue, Béliveau says. And that's good news, because lycopene was found to stop endometrial cancer cell growth in a study in Nutrition and Cancer. Endometrial cancer causes nearly 8,000 deaths a year.

Helps fight: endometrial, lung, prostate, and stomach cancers

Your Rx: The biggest benefits come from cooked tomatoes (think pasta sauce!), since the heating process increases the amount of lycopene your body is able to absorb.

Next: Walnuts